A beam of light passes from air into a substance X. If the angle of incidence be `72^(@)` and the angle of refraction be `40^(@)`, calculate the refractive index of substance X. (Given: `sin72^(@)=0.951` and `sin40^(@)=0.642)`

Define Snell's law of refraction. A ray of light is incident on a glass slab at angle of incidence of 60^(@) . If the angle of refraction be 32.7^(@) , calculate the refractive index of glass. (Given: sin 60^(@)=0.866 and sin32.7^(@)=0.540) .

A ray of light passes from vaccum into a medium of refractive index n. If the angle of incidence is twice the angle of refraction, then the angle of incidence is

A ray of light passes from vaccum into a medium of refractive index n. If the angle of incidence is twice the angle of refraction, then the angle of incidence is

A ray of light passes from vaccume into a medium of refractive index n. if the angle of incidence is twice the angle of refraction, then the angle of incidence is

A ray of light passes from vaccuum to a medium refractive index mu . The angle of incidence is found to be twice the angle of refraction. The angle of refraction is

A ray of light passes from glass having a refractive index of 1.6, to air. The angle of incidence for which the angle of refraction is twice the angle of incidence is

A ray of light passes from glass, having a refractive index of 1.6, to air. The angle of incidence for which the angle of refraction is twice the angle of incidence is